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@citen tats 'atent @ffice SMITH D. WAGKMAN, OF AUBURN,NEW YORK.

Letters Patent No. 78,623, dated June 2, 1868.

-' dige Srlgehule mata' in in tipa ittici ttart mit mating gaat nf tige stmt.

TO ALL WHOM IT MAY CONCERN:

:Be it known that I, SMITH D. WAGKMAN, of,A uburn, in the county of Cayuga, and State of New York,

have invented certain new and useful mprovements in Machinery for Sharpening Harvester-Cutters, of which the following is afull, cleara nd exact description, reference being had to the accompanying drawings, which make part of thisspecication, and in which--` Figure 1 represents a plan or top view of a machine to which my improvements are applied.

Figure 2 represents a view in elevation of one side of the same, an'd l Figure 3 represents o. similar view of thesame, as seen From one end.

Figure 4 represents a transverse central section, through a stone'7 of a modified form., showing another way in which the section nearestthe eye ot`. the cutter-bar may be sharpened.

I Figure' represents 'a similar section through my improved stone, showiiig the way'in which I prefer to' grind the knives. A

The rst branch oi' my invention relates to the clamp-rrame in which vthe cutters are h'eld while beingsharpened, and this part of my invention consists in combiningwith a grindstone an adjstable clamping-frame, suspended from overhanging arms, whereby the cutters can be presented to the stone at any desired angle.

The next part of my invention consists in so constructing the oscillating overhanging frame that it may readily be attached to or removed from the frame of the grindstone, whereby the machine is rendered portable.

The next part of my invention consistsin combining with an overhanging grindstone, having its supports pivoted so as to allow it to turn, a'n adjustable suspended oscillating clamp-frame, whereby great facility in grinding cutters of different angles is secured.

In the accompanying drawings, which show all my improvements as embodiedin one machine, and exem plify one practical way of carrying out my invention,

A stout frame, A, is shown, as supported on legs a.

The grindstone E is mounted on one end of a shaft, D, turning in suitable bearings 'in' a bracket or standard, C, and driven by a crank, or in any other well-known way. This standard CV is mounted on a bed-plate, B,'which rests upon the frame A, to which it is clamped by a set-screw, b', passing through a slot, b, in the bed-plate, and forming a pivot, on which the bed-plate may be turned horizontally, to vary the angle of the face of the stone relatively to the frame. I am aware, however, that a stone mounted in a frame, turning on' a pivot, is not new.' A water-trough, F, is also mounted on the bed-plate B.

The grindstone, as shown in iig. 5, is constructed with its sides bevelled near the periphery, at an angle. The cutters are ground on this bevelled part of the stone. When the bevelled edge of the cutter-section lies flat against or parallel with the grinding-surface, asit does when being sharpened, the cutter-bar is presented at such an angle to the side of the stone that'thc eye of the cutter-bar projects beyond the stone, and is thus prevented from striking it. This obviates what has heretofore proved tobe a serious obstacle to the success of this class ci machines.

In order to adapt the stone to cutters ci different angles of bevelling, I form a cent-ral depression, e2, in the side of the stone, as shown in iig. 5. vThis depression allows the eye of the cntter-bar to pass within the plane of the stone, if desired.

I have illustrated this idea more fully in fig. 4, which showsa modified form of the stone. In this figure a central boss is shown, leaving an annular groove, el, of a width and depth sufficient to admit the entire eye 'within the plane of the stone, if necessary. I generally, however, prefer to apply the cutter-bar to the stone at the angle shown in iig. 5, as, in that position, the eye can be moved endwise and forward without striking the stone. Y

I am aware that it has been proposedto form annular grooves in the side of a griudstone, but such grooves were merely for the purpose of forming a raised band for a grinding-surface, and were not adapted to receive lthe eye of the cutter-bar, nor were they used in combination with a bevelled grindingsurface.

. device.

In iig'. 5, both'sides of the stone are shown as bevelled, and` as having central depressions.

Two vertical posts, G- G', are mounted in the end-timbers ofthe frame A, their lower ends being rounded, and passing through round holes in the frame. They'are fastened by pinspassing transversely lthrough them below the frame. The posts are thus free toturn axially in the frame.

A bracket or arm, H, projects horizontallyffrom each of these posts, and has a horizontal slot, h, in it, 'in which a journal, h1, moves. l These journals are provided with collars and jam-nuts by which they can be clamped at any desired distance from the posts GG. l

From these journals arms-I are suspended, so as to, swing freely in a vertical plane, at right angles to their bearing. i The lower ends of these arms are rounded, and passfthrough corresponding holes in a rack or bar, J, and are held by prins underneath the baror in some *other propervell-known way. These arms can thus turn freely axially in-` the rack, which latter has a ilunge, j, on its loweredge, to support the cutter-ban' and adjustable hooked clamps c, to hold the bar on the flange.

The turning-posts G G enlble the rack J to be traversed lengthwise across the side of the stone, the slotted arms H and journ'alsI enable it to be presented at any desired angle to the stone, and the' swinging arms I enable it to be swung ,towards or from the stone, thus securing an almostunlimited range of adjustment.

.To hold the cutters securely against the stone while being ground, a cord 'or wire, l, is attached to the rack, passed through `kan eye, l', and attached to a treudle, L, which may be attached to the frame, or' rest loosely on the ground, as shown in. thegdrawings.

By bearing ou the treadle withhis foot, the operator draws the rack and cuttersup tothe stone, and still has his hands free to turn the crank, or to slide or hold the 4cutter's'n'the rack. When one side of the cutters is ground,the cord is detached `from its fastening at' one end of the clamp-frame, und.l attached at the other end, that it may draw and hold the other edges against the stone. A l v 1 Jointed levers would answer a goodpurpose, but I preferafcord or wire, as the more simple und Veffectual 'The operatiomof the machine-will readily be understood from' the foregoing'd'escriptioh.

It is manifest that the ,frame A, thebed-plate and stone, and the posts -wlxich support 4the clampframe,

can readily be detached from each other, andlrthat the posts and clamp-frame could rendilyvvb'e applied to an ordinary, grindstone, 'and do good work. f

What I claim as my invention, and desire to secuiewby Letters Patent, isl 1. The combination, substantially as set forth, with a, grindst'one, of. an oscillating adjustable clampingframe, suspended from overhangng arms, for the purposes setforth.

2. The combination, substantially as set forth, with'the frame of Vthe vertical detachable turning-posts G, the over-hanging slotted brackets H,- the journals, the swivelling suspension-rods, and the clamp-bar, for the Vpurposes specified.

3.' The-combination, substantially as set forth, of a supporting-frame, abcd-plate turning on n. pivot on said frame, a grindstone' mounted on and turning with said bed-plate, nu adjustable overhead supporting-frame,

an'd a suspended oscillating clamping-frame, for the purposes specified.

. In testimony whereof, I have hereunto subscribed my name,

s. DQ: -wuemsma` Witnesses: i

.Henson T. CooK,

Jos. I. Panos. 

